Projectile.



- PATENTED APR. 28, 1903.

L. P. HOLMBLAD.

PROJEGTILE.

APPLICATION TILED AUG. 8, 1900.

NO MODEL.

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LAURITZ P HOLMBLAD, OF CHICAGO, ILLINOIS.

PRQJECTELE.

srncrrzcarion' forming part of Letters Patent no. 7%,291, dated April as, t me.

Application filed August 8,1900.

T0 wZZ whom it may concern.-

Be it known that I, LAURITZ P. HOLMBLAD, a subject of the King of Denmark, and a resident of Chicago, in-the county of Cook and 5 State of Illinois, have invented certain new and useful Improvements in Projectiles; and ldo hereby declare that the following is a full, clear, and exact description, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention provides means for avoiding the retardation due to the vacuum formed behind a projectile in transit.

The invention consists in the matters hereinafter described, and more fully pointed out and defined in the appended claims.

in the drawings, Figure 1 is a side elevation of a projectile embodying my invention. Fig. 2 is a rear elevation of the same. Figs. 3 and 4 are longitudinal sections of the same. Figs. 5, 6, and 7 are longitudinal sections illustratim details of the rearwardly-directed flange. Fig. Sisa longitudinal section of an explosive projectile or shell embodying my invention. Fig. 9 is a fragmentary view, in longitudinal section, showing the flange secured to the projectile-body by spinning.

As shown in said drawings, A indicates a projectile-body having a pointed'or tapered rear end and provided at its rear end with a rearwardly extending flange a, which, as shown, is relatively thin and adapted to break away from the body of the projectile upon leaving the gun. Said projectile may be cast or otherwise constructed integrally and provided with a rearwardly directed flange, which may be integral or not, as preferred. If preferred, the projectile may be con-' structed, as indicated in Figs. 3, 4, and 5, with a sheath of metal inclosing a central core of like or of different metal in a familiar manner. Said outer sheath may extend rearwardly, forming the flange a, which at its point of union with the sheath and the body of the projectile is preferably grooved, the more readily to permit the same to be broken therefrom as the projectile leaves the gun.- As shown in Fig. 3, said central body at its 5o rear end is or" greater diameter than the inner diameter of, said sheath and tapers rear- Serial No. 26,234. (No model.)

wardly from the end of the same. A nange, preferably of a different and more frangible metal, is secured on the inclined rear end a and incloses said tapered rear end. In Fig. 4 said flange is shown as integral with the sheath A and provided at the point of junction with an internalgroove. The central body or core of said projectile fills said sheath en-. tirely in a familiar manner and is provided with a flange, also filling said groove, from which pointit tapers rearwardly to approximately the same length as said flange and terminates in a slightly-rounded point. The form illustrated in Fig. 5 is similar to that illustrated in Fig. 4, with the exception that instead of a groove the entire flange a is made relatively thin. Figs. 6 and 7 illustrate projectiles constructed integrally, with the flange or also integral therewith. As shown, said flanges are weakened at the point of connection with said projectile by means of a groove cut in said flange in such a manner that when the same breaks away from the projectile the rear surface of the same is uniformly smooth and tapering. Such a groove is shown in Fig. 6 on the inner side of .the flange and in Fig. 7 on the outer side thereof.

Obviously my invention may be embodied in explosive projectiles or shells, as shown in Fig. 8, in which A indicates thepointed hollow body of the shell or projectile, A the explosive contained therein, and D a base-plug having screw-threaded engagement withthe body A and provided. with a central screwthreaded aperture adapted to receive the tapered plug cl and the fuse-plug d, of familiar form, respectively, at the inner and outer ends of the same. The base-plug D and the plug 01 are provided with spanner-notches to permit the same to be engaged by suitable wrenches, and the plug 0 is provided. with a transverse slot on its outer end adapted to permit engagement of the same with a screwdriver. ..flfhe flange a, as shown, is of a different metal than the body A, though, obviously, the same may be constructed interally, if preferred, and is rigidly secured to the base-plug.

0 indicates a rotative band of copper or other soft metal seated on the rear end of the ECO 1o tndinal grooves and adapted to break away from theprojeetile after the discharge of the gun and a band of soft metai rigidly secured on the butt'of said casing.

In testimony whereof I have hereunto subscribed my name in the presence of two subis scribing witnesses.

- LAURITZ P. HOLMBLAD.

In presence of C. W. HILLS, LOUIS J. DELSON. 

